Previous answer is
　Mumei(Unsigned) attributed to Den Nakajima Rai
無銘(伝中島来)

Features: Raikuni Kuninaga, one of the students of Rai kunitoshin, later worked in Nakajima, Settsu, hence called Nakajima Rai. His style closely resembles that of Rai Kunimitsu, with a shape and curvature that leave nothing to be desired.

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Appraisal Quiz #785 (March 9th, 2024)
Who made this sword do you think ?
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Blade length : 71.1 cm or 27.99 inches.
Sori : 1.8 cm or 0.70 inches.
Mekugi : 1
Width at the hamachi : 3.30cm or 1.29 inches.
Width at the Kissaki : 2.43 cm or 0.95 inches.
Kasane : 0.75 cm or 0.29 inches.
Shape : Wide and thick blade with deep Sori, longer Kissaki.
Jitetsu : Ko Itame Hada well grained with Jinie attach.
The Jigane is clear and beautiful.
Hamon : Nie Deki, Gunome Midare with many Ashi.
In the Ha, there are many Kinsuji. Boshi is Midarekomi style.

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